Multiple‐Factor Influence on Air Quality of Road Motor Vehicles Tail Number Limit in Administrative Area of Beijing, China

Table 2

Pearson correlation analysis of restricted days with non-4 and 9 restricted days.

	Peaks and valleys (n)		R^2	Pearson correlation coefficient	X^2
	Tail number of 4 and 9 days	Tail number of non-4 and 9 days
AQI	6	6	0.6835	12.0887	0.6672
PM2.5	6	6	0.7046	4.6509	0.6123
PM10	6	6	0.5995	17.6523	0.5052
SO2	6	6	0.7593	11.8825	0.1913
CO	6	6	0.6341	22.7531	0.6329	<0.01
NO2	6	6	0.6351	15.6144	0.8259	<0.05
O3_8h	6	6	0.6665	35.1589	0.1806	>0.05